char msgs[5][15] = {
"Right Key OK ",
"Up Key OK ",
"Down Key OK ",
"Left Key OK ",
"Select Key OK" };
char start_msg[15] = {
"Start loop "};
int adc_key_val[5] ={
30, 150, 360, 535, 760 };
int NUM_KEYS = 5;
int adc_key_in;
int key=‐1;
int oldkey=‐1;
void setup() {
pinMode(13, OUTPUT); //we'll use the debug LED to output a heartbeat
Serial.begin(9600);
/* Print that we made it here */
Serial.println(start_msg);
}
void loop()
{
adc_key_in = analogRead(0); // read the value from the sensor
digitalWrite(13, HIGH);
/* get the key */
key = get_key(adc_key_in); // convert into key press
if (key != oldkey) { // if keypress is detected
delay(50); // wait for debounce time
adc_key_in = analogRead(0); // read the value from the sensor
key = get_key(adc_key_in); // convert into key press
if (key != oldkey) {
oldkey = key;
if (key >=0){
Serial.println(adc_key_in, DEC);
Serial.println(msgs[key]);
}
}
}
digitalWrite(13, LOW);
}
// Convert ADC value to key number
int get_key(unsigned int input)
{
int k;
for (k = 0; k < NUM_KEYS; k++)
{
if (input < adc_key_val[k])
{
return k;
}
}
if (k >= NUM_KEYS)
k = ‐1; // No valid key pressed
return k;
}
Pin Allocation
"PWM Mode"
Pin
Function
Digital 4
Motor 1 Direction control
Digital 5
Motor 1 PWM control
Digital 6
Motor 2 PWM control
Digital 7
Motor 2 Direction control
"PLL Mode"
Pin
Function
Digital 4
Motor 1 Enable control
Digital 5
Motor 1 Direction control
